Binary binomial sequential analyzer



July 10, 1951 R. w. JONES BINARY BINOMIAL SEQUENTIAL ANALYZER 4-Sheets-Sheet 1 Filed- March 31; 1948 JNVEN TOR.

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July 10, 1951 R. w. JONES BINARY BINOMIAL SEQUENTIAL ANALYZER 4 Sheets-Sheet 2 E206 23 mo. v o...

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Filed March 31, 1948 v ROY W. JONES July 10, 1951 R. w. JONES BINARY BINOMIAL SEQUENTIAL ANALYZER 4 Sheets-Sheet 5 Filed March 31, 1948 ROY W. JONES ATTORNEY July 10, 1951- R. w. JONES I BINARY BINOMIAL SEQUENTIAL ANALYZER Filed March 31, 1948" A sn'ets-shet 4 INVENTOR. ROY- W. JONES ATTORNEY Patented July 10, 1951 BINARY BINOIWIAL' SEQUENTIAL ANALYZEB.

Roy wcJones Rochester, N. Y., assignor to AutomaticeElectric.Laboratories, Inc., Chicago, 111., a

orporati n (vi-Dela ApplicationMarch 31, 1948, Serial No. 18,265

14 Claims. 1 3

The present invention relates 'in-general -to adding machines and" more particularly tocan adding machineof the all-relay binary -type arranged 'tobe" used "as a *binomial sequential analyzer. I

Briefly, binomial" sequential analysis is an analytical method of interpreting inspection and test data according to certain mathematical formulae. It is defined as a statistical test procedure which gives a specific rule, at any stage (i of the experiment, for making one of the following three decisions: (1) accept the subject matter under test, (2) reject the; subject matter under test, (3) continue taking observations.

The process of sequential analysis finds a useful application inthe field of production testing and inspection, that is, where a sample is taken from a finished lot of goods and is tested; the

possibility of deciding to obtain further data.

Under the sequentialplan, the inspection willbe terminated as soon as the quality of the sample has been determined within the limits'of the probability risks established. The chief merit of sequential analysis, then, is that it may'require smaller samples thanmultiple sampling.

The method .of sequential analysis involvesthe addition of a discrete valuefor every good sample examined and the subtraction of a predetermined discrete value .for every bad sample examined. If a predetermined negative total is reached-the lot under inspection is rejected, or if a predetermined positive total is reached the lot is accepted as good. In sequential inspection, the

size of the sample, for a particular lot is "left g undetermined. The sequential procedure is "to inspect one piece at a time, inspection being continued until the cumulated'evidence is sufiiciently strong, one way or the other, for the-analyzer to call the lot good or bad. Thus conspicuously good lots are quickly accepted and conspicuously bad lots are quickly rejected. Extensive "inspection is needed chiefly by lots of doubtful quality, which'is as it should be.

In accordance with the'usual practice 'of any inspection 'plan certaintolerances are set up in order-to classify'each'sample inspected as to its classification of being good orbad'; "A sequential analysis plan is completely determined by four established numerical "quantities: Two of these quantities specify (1) what is considered a good lot and (2) Whatis. considered a bad lot.

Dependent upon the.:article..-being manufactured and in accordance with the usual practice a lot may be arbitrarily termed as acceptable if only a predetermined percentage is badplwhile lots with asecond predetermined percentage-bad are non.-.acceptable,.and..lots havingpercentages bad between .the above-:mentioned, lpercentages being. left. indeterminate. The..established .ac-

ceptable percentagel for..accepting..a.good lot will now beldesi-gnatedfil and, the..established-unacceptable percentage for rejecting. a. bad. lot .Will now, be .designatedPZ. PLthereforeequals the .,percentage..bad of. a lot .which themserris willing to accept as a good lot. P2 thenequalsthepercentage bad of a lot which the user is unwilling to accept and therefore'will reject a lotwitli P2 percentage.

It is well known that-in any sampling inspection procedure, where thereis'not 100%fi'nspe'ction, there is always some possibility, or risk; of making a wrong decision and therefore'thej two other numerical quantities to be determined in the sequential analysis" plan are '(3)"what risk is the inspector (or user) willing to run of rejecting a good lot, and (4) what 'risk'is the inspector (or user) willing town 'of accepting a bad 'l'ot.

The user is willing to take'a c'ertain'percentage risk of rejecting good material','for'example; say one chance in ajhundre'd", er-.01: This percentage risk will be designated a (the Greek" "letter alpha) and in the example given d= .01."' l

The user is also willing'totake'a difierentpercentage risk of accepting bad materiaL'for'examp1e,'say two chances in a hundred, or 1'02." This different percentage risk will be designatedflflhe Greek letter beta)' and in the example given [3V=.02;

Fromthe foregoing it will be seen that the tolerated risks are characterized by four numbers P1, P2, 11. and 5 which are established on a basis of practical ."considerations commensurate with the item being inspected andwill naturally assume different values dependentupon 'thedifferent types of apparatus oritemsbeinginspected. When'uuantities P1, P2, -wand B have been established"thenecessary computationsdefiningsequential inspection can be computed by means-of the "followingformulae' which were" derivedfrom formulae'given in Sequential Anal ys'is of Statistical Data: Applications, a report prepared bythe --Statistical Research-"Group of Columbia University'and publishe'd by th'e Golumbia University "Press, September l-9l5;--' Another publication Sequential Analysis by Abraham Wald, published in 1947 also deals with this new method of statistical analysis.

In order to perform a sequential analysis four quantities must be known, (1) the additive quantity, (2) the positive limit, (3) the negative limit, and (4) the subtractive quantity. In the present example the subtractive quantity is taken as 75 for all cases. These quantities are deter- P1=the acceptable quality tolerance limit for the lot, expressed as a fraction defective. P2=the unacceptable quality tolerance limit for the lot, expressed as a fraction defective. c=the maximum risk or probability of rejecting lots of quality. P1 or better, expressed as a decimal fraction. p=the maximum risk or probability of accepting lots of quality P2 or worse, expressed as a decimal fraction.

The quantity 7 appearing in the above formulae is a result of arbitrarily choosing the value 75 for the subtractive quantity. Any value deand to thereby register the resultant amount in binary form.

Another feature is the provision of a chain of register units, sequentially corresponding to the successive binary digit orders in a binary number, in which each register unit is provided with a register relay which is controlled from the next lower order register relay and which extends control to the next higher order register relay and also in which intervening circuit connections are provided at each register unit to control the register relays at such units to add desired predetermined binary numbers.

A still further feature of the invention is the provision of a binary all-relay type adding machine which will give a signal when the cumulasired may be used instead provided that the other quantities are modified accordingly as indicated in the formulae. The additive quantity is generally a decimal fraction of the subtractive quantity, hence the choice of '75 for the subtractive quantity permits the additive quantity to be conveniently expressed as a whole number.

The above-mentioned formulae and the basis for such formulae are not considered part of this invention and are being shown and briefly explained only for the purpose of showing the utility of the calculating machine which comprises applicants invention.

Having briefly described the system of sequential analysis with which the instant invention is concerned and-the mathematical formulae upon which this system of analysis is based and its derivation, the principal object of the present invention is to provide a binary type of automatic adding machine using only relaysso arranged as to perform the functions of a binomial sequential analyzer.

Another object of the invention is the provision of a binary type adding machine which will automatically add a predetermined discrete quantity, called the additive quantity, for every additive input transmitted to the machine.

A feature of the invention is the provision of a binary type adding machine which will effectively subtract a predetermined discrete quantity for every subtractive input transmitted to the machine. I

t A further feature of the invention is the provision of a series of register relays which are sequentially controlled to add binary numbers tive total resulting from the various inputs to the machine has reached a predetermined positive or negative quantity.

A further feature of the invention is the provision of indicating means associated with each register relay and controlled thereby to indicate the binary digits 0 or 1 dependent upon the operated or released condition of such register relay.

GENERAL DESCRIPTION This binary sequential analyzer is a type of adding machine in which the calculations are performed by relays. It is capable of adding a discrete value each time an electrical circuit is closed to the input circuit for addition and of effectively subtracting another discrete value each time an electrical circuit is closed to the input circuit for subtraction. The calculations start from an initial value of zero. When the total reaches a predetermined discrete positive value, an electrical circuit operates to indicate that the positive limit has been reached. Likewise, when the total reaches a predetermined discrete negative value, another electrical circuit operates to indicate that the negative limit has been reached. The calculations are made in the binary system of arithmetic in which twofigures only, 0 and l, are used in lieu of ten digits; the cipher multiplying everything by 2. Thus 1 is one, 10 is two, 11 is three, is four, etc. In this circuit a register relay at normal is used to indicate the binary figure l and when operated indicates the figure 0. Nineteen register relay units are provided which means that binary numbers requiring nineteen or less figures can be registered. 2 or 524288, in ordinary arithmetric, is the first number which requires twenty figures in the binary system. Thus 524287 is the largest value which can be totaled by this analyzer. Seventeen lamps are associated with the first seventeen register relays and give a visual indication of the total registered. A dark lamp represents the figure 0 while a lighted lamp represents the figure l. The maximum total that can be indicated by the lamps is 2 -1 or 131,071 since 2 is the first binary number requiring eighteen figures or digit orders. The positive and negative limits can be set to any desired value between 1 and 131,071.

Each of the nineteen register relay units has associated with it a pair of register relays which are required to provide the necessary electrical operations. Two lever type keys are associated with each of the. first seventeen pairs of register relays. These keys are used to establish the positive and negative limits. Also associated with each of said firstten pairs of register relays is a turn key for establishing the subtractive quantity.

asst-uric There is also a secondturnkey associated-with each register relay pair, up'to ten, for establishing the additive quantity. The additive and subtractive quantities are variable between 1 and 1023.- The operation of this machine is not reversible and subtractions cannot be made directly.

Subtraction is effectively accomplished by adding a large number greater'than the machine is capable of handling. When n is the number to be subtracted, the subtraction is obtained by adding the number 52428841, or since 75 is thesubtractive quantity then 524288-75 equals 5 242 13. The number 52 213 is therefore added each time the-subtractive quantity, or "75, is to-besubtracted from the total.

Referring now to the drawings, Figs. 1, 2, 3 and 4 show a series of register-relay units, a series of positive limit lever keys P, a series of negative limit lever keys N, addition turn keys A, subtraction turn keys S, a series of adding relays AD, a series of subtraction relays SB, and a'lamp for each register unit except the last two register units.

Each register relay unit, comprising a pair of register relays R, corresponds to a difierentbinary digit order and the respective register relayunits are connected in a series circuit in accordance with their corresponding binary digit order.

Fig. 1A shows the circuits for'providing operating current for Figs. 1, 2, 3 and 4. Associated with each register relay unit, except-the last two, isa'positive limit key P, which keys are connected in series through contacts of the register relays. These positive limit keys also correspond to successive binary digit orders and are manually set in accordance with'a predetermined-positive limit binary number.

Also associated with each register unit, except the last two, is a negative limit key N, whichkeys are connected in series through contacts of the register relays. These negative limit 'keys correspond to successive binary digitorders and are manually set in accordance with a predetermined negative limit binary number.

Ten addition turn keys A, associated respectively with the first ten register relay units, correspond to succesive binary digit orders and are manually set in accordance with a predetermined additive binary number to'control their respective register relays, in case the corresponding key is set in operated position, to add the binary digit 1 to a previous registration therein when the corresponding adding relay ADis operated. 1

Ten adding relays AD, associated respectively with the first ten register relay units, correspond to successive binary digit orders and are sequentially operated to add the binary'digit l to its respective register unit in case the corresponding addition key A is set in operated position.

Ten substract turn keys S, associated, respectively, with the first ten register relay units,

correspond to successive binary digit ordersand aremanually set in accordance with a modetermined subtractive binary number to control their respective register relays, in the eventithat the corresponding subtract key S is set in operated position, to add the binary digit 1 to a previous registration therein when the correspondingsubtract relay SB is operated.

Nineteen subtract relays SB, associated respectively with register relay units, correspond to successive binary digit orders and are sequentially operated to cause a predetermined binary iii) number to be added to the. total registered in the register units.

The first ten subtractrelays SB each causethe binary digitl to be added to its corresponding register unit only in case the corresponding subtract key S is manually set to its operated position. The remaining subtract relays, upon operation, each causes the binary digit 1 to be added to its respective register unit and therefore the eleventh to the nineteenth subtract relays each automatically adds the binary'digit 1 to its corresponding register unit.

It should be mentioned at this time that both the addition and subtract relays AD and SB are considerably slower to operate than the register relays, so that, after an operation of one of the addition or subtract relays, several register relays can operate, if necessary, before the suc ceeding addition or subtract relay in the chain is operated. This difference in the operate time of the register relays and the addition or subtract relays is to provide time to allow the register relays to operate and register carryovers from one register unit to the next.

A lamp is associated with each of the first seventeen register relay units and such lamps are controlled by their respective odd register relays R. A dark lamp indicates registration of the binary digit 0 while a lighted lamp indicates the registration of the binary digit 1.

Fig. 1 also shows'an additive input conductor A which may be grounded in any desired manner each time an additive input is transmitted to the machine. A subtractive input conductor S may also be grounded in any desired manner each time a subtractive input is transmitted to the machine. A positive register PR is shown in Fig. 1

to register the number of times an additive input is received by the machine. A negative register NR is also provided to register the number a negative input is received by'the machine. A total register TR is provided for registering the sum of both the positive and negative inputs received by the machine.

In Fig. 2 there is shown a positive limit relay PS which is operated when the register units reach the binary number set up on the operated positive limit keys P and a positive limit register PLR which operates each time the positive limit. is reached by the register relays. Fig. 2 also shows a negative limit relay NS which is operated when the register units reach the binary number set up on the operated negative limit keys N and a negative limit register NLR which operates each time the register relay units reach the negative limit. Lamps PSL and NSL are respectively lighted when the positive and negative limits are reached. Contacts 294 to 251 are provided to control remote negative and positive signals, if desired.

Fig. 1A shows the means for providing direct ground and battery connections for operating the relays and lamps derived from an alternating current source by means of the full-wave rectifier FWR, transformer T and switch SW. The

grounded conductor I93 is connected to all the ground symbols throughout the drawings. The battery lead I94 is connected to all the battery symbols shown at the lamps and the battery lead I94 is connected to-all'battery symbols shown at the various relays.

' A reset key RS is shown in'Fig. 1A which is momentarily operated to cause the operation of reset relays RSI and RS2 which in turn transmits a momentary ground'pulse to register relay RI to cause its operation and the operation of'all succeeding odd numbered register relays R in the successive register relay units.

Having briefly described the drawings a better understanding of the invention will be had by explaining-the operation of the machine for a specific example. Let it be assumed that the additive quantity as computed by equation 1, previously set forth, equals 7 which translated into binary figures is I I I. The additive turn keys AI, A2 and A3, corresponding to first, second and third binary digit order, are set to their operated positions. The other additive turn keys A4 to All],

inclusive, remain set in normal, or zero, positions. With keys AI, A2 and A3 set in their operated positions, each additive input to the machine adds the binary number II I to a previous registration in the register relay units.

The positive limit as computed by equation 2 is assumed to be 51,200, or 01100100000000000 in binary figures. The positive limit keys PIB, PI5 and P12 are manually set to their operated positions while the remaining positive limit keys PI to PI I, inclusive, PI3, PI4 and PH remain set in their normal, or zero, positions. With the positive limitkeys set in this order the positive limit is set for 51,200.

The negative limit as computed by Equation 3 is also assumed to be 51,200. In order to set up the negative limit of 51,200, such number must be interpreted in terms of a negative total. To arrive at this interpreted negative total, the predetermined negative limit 51,200 is subtracted from 131,072 (which is 2 131,072 minus 51,200 equals 79,872. The binary number corresponding to 79,872 is 10011100000000000. with this binary number the negative limit keys NI'I, NI4, NI3 and NI2 are set to their operated positions while the remaining N keys are set to their normal, or zero positions.

As previously described the subtractive quantity is determined as 75 and to subtract this number it is necessary to add 524288-75 or 524213. The binary number corresponding to 524213 is 1111111111110110101. The register relay units corresponding to the eleventh to the nineteenth binary digit orders are arranged to automatically add the binary number 523,264, or binary number 1111111110000000000 for each subtractive input received. 524288523,264 is 1024. It is now necessary to add 1024-75, which equals 949, in

order to reach 524213. 949 translated into a binary number is 1110110101. Subtractive turn keys S are associated With only the first ten register relay units and in order to subtract 75 for each subtractive input received it is necessary to operate the S keys in accordance with the binary number 1110110101. Therefore, keys SID, S9, S8, S5, S5, S3 and SI are manually set to their operated positions while the keys S1, S4 and S2 are maintained in their normal, or zero positions. Since'the register relay units corresponding to the eleventh to the nineteenth binary digit orders are arranged to automatically add the binary number 1111111110000000000 and the S keys SI,

S3, S5, S5, S8, S9 and SI!) are set in their operated positions, the binary number 1110110101 is also added each time a subtractive input is received by the machine. The sum of these two binary numbers is 1111111111110110101, or the decimal number 524213, which equals 524288-75.

As previously stated the positive and negative limits may be set to any value from 1 to 131,071 the additive and subtractive quantities may also be varied between 1 and 1023 in accordance with the previously mentioned formulae to meet the In accordance desired .analysis. In the example about to be described the analyzer is operated from an automatically operated machine which has a gauge which automatically tests each finished part after each operation and which transmits a ground pulse over the additive input lead A each time the gauge passes a good part and which also transmits a ground pulse over the subtractive input lead 5 each time the gauge rejects a bad part. In this example the positive and negative limits have both been determined as 51,200, the additive input as 7 and the subtractive input as 75.

In order the connect direct current. derived rfom the commercial AC source to the circuits, switch SW is operated thereby connecting the alternating current source to the transformer T which by means of the full-wave rectifier FWR connects positive direct current (hereinafter called ground) to conductor I93 and to all the ground symbols shown throughout the drawings,

and connects negative direct current (hereinafter called battery) to conductors I94 and I95 and to all the battery symbols throughout the drawings. Pilot lamp P is now lighted over an obvious circuit to advise the operator that operating direct current is connected to the machine. The connection of negative battery potentialv to conductor I94 completes circuits for lighting all of the lamps LI to LI'I, inclusive, over obvious circuits extending from back contacts on the odd numbered register relays, for example .from ground (I93) back contacts I35 and through lamp LI to negative battery (I94). The illumination of all these lamps advises the operator that all lamps are in proper working condition and are not burned out. Slow to release relay SL is operated over contacts I04 and H4 to prepare at contacts H6 and H5 locking circuits for relays SBI and ADI.

As previously stated positive limit lever keys PIG, PI5 and PI2 are manually set by the operator in accordance with the binary number 01100100000000000 (decimal number 51,200) the negative limit lever keys NII, NI4, NI3 and NIZ are set in accordance with the binary number 10011100000000000 (decimal number 79,872), the subtractive turn keys SID, S9, S8, S6, S5, S3 and SI are set in accordance with binary number 1110110101 (decimal number 949) and the addition turn keys Al, A2 and A3 are set in accordance with the binary number 111 (or 7).

To put this device into operation initially or to start a new series of observations, the reset key RS is momentarily operated. In response .to the operation of reset key RS a circuit is completed for operating slow-to-release reset relay RSI from ground (I93) key RS, winding of relay RSI to battery (I95). At contacts I05 relay RSI disconnects negative battery conductor I96 from conductor I95 to thereby remove battery potential from all the relays. At contacts I06 relay 'RSI closes an obvious circuit to operate slow-to- .release relay RS2.

Relay RS2 operates and at contacts I07 prepares a circuit for operating the first odd register relay RI.

When the operator observes that all of the lamps LI to LI'I are illuminated and in proper operating condition she will restore the reset key RS to, normal to open the circuit of relay RSI which restores after a short interval of time. At contacts I05 relay RSI connects conductor I96 I95 to thereby connect battery potential to all of the register relays. At make contacts I06 relay RSI opens the circuit to relay RS2. Relay RS2 due to its slow-to-release characteristics holds its contacts I01 closed for an interval. before restoring and at this time a momentary circuit may be traced for operating relay RI as follows: from ground, back contacts I06, I01, I2I and through the lower winding of relay RI to battery. Relay RI operates contacts I3I and I32 to prepare circuits in the positive limit and in the negative limit test circuits, respectively. At contacts I33 relay RI prepares a circuit for its upper winding, at contacts I 34 completes a locking circuit for its lower winding through the upper winding of relay R2 to ground and in parallel through the associated resistance to ground, at back contacts I35 extinguishes lamp LI and at make contact I35 completes an energizing circuit for relay R3. Relay R2 is notenergized at this time because its upper winding is short circuited over the initial energizing circuit of relay RI and contacts I34. The circuit for. energizing relay R3 extends from ground at make contacts I35, back contacts I 4|, operated add key A2, unoperated subtract key S2, backcontacts I6I and through the lower winding of relay R3 to battery. In a similar manner relay R3 at contacts HI and I12 prepares circuits in the positive andv negative limit circuits, at I13 prepares a circuit for its upper winding, at I14 prepares a circuit for locking relay R3 in series with the upper winding of relay R4 when the operating ground is removed from make contacts I35, and at I15 extinguishes lamp L2 and completes the energizing circuit for relay R- The circuit for relay R5 extends from ground, I15, I8I, operated add key A3, I9I, operatedsubtract key S3, 2I5 and through the lower winding of relay R5 to battery. Each succeeding odd register relay R1 to R31, inclusive, is operated over a similar circuit from the preceding odd register relay. Relays R5, R1, R9, RI I, RI3, RI5, RI1, RI9, R2I, R23, R25, R21, R29, R3I, R33, R35 and R31 are locked in energized position through their lower windings and also extinguish their associated lamps. All of the odd register relays RI to R31 are now locked operated and all of the lamps LI to LI1 are extinguished. When slow-to-release relay RS2 finally restores and opens the original energizing circuit of relay RI, the short circuit through the upper winding of relay R2 is removed with the result that relay R2 now energizes in series with the lower winding of relay RI. This circuit may be traced from ground through the upper winding of relay R2, contacts I34. and through the lower winding of relay RI to battery.

At contacts I2I relay R2 .opens the original energizing circuit through the lower winding of relay. RI andprepares circuits through its lower winding and: theupper winding of relay RI. Since. relay Rt is maintained operated through relay R2, relay RIatmake contacts I35'maintains theupper .windingof relay R4. short circuitedand. relay R3 energizeduntil the short circuit. around the upper winding of-relay R4 is opened" In asimilar manner the upper windings offall the even numbered register. relays. R6, R8 etc, are short. circuited from the preceding odd register relays. The calculator. is now ready to receive additiveinputscover the additive lead. A and subtractive inputs over the subtractive lead S.

ADDITTVE TNPUT 1 -W-hen the additive-input lead'A is -momentarily grounded the first addrelay-AD I is operated; over am obvious circuit and at con-tacts- I03 completes 10 a locking circuit for itself from ground at contacts 5. At contacts I09 relay ADI completes a circuit to operate the positive register PR and at I08 completes a circuit to operate the, total register TR. At contacts IOI relay ADI completes a circuit for holding relay R2. operated and forkicking differential relay RI down to its released position, at I02 completes the circuit for operating the second add relay AD2 and at I04 opens the energizing circuit to the slow-to-release relay SL. Relay SL is made slow tore.- lease inorder to hold add relay ADI operated for a short. intervalof time from contacts II 5 after. the ground on the input lead Ahas been removed. As previously mentioned it. should be borne in mind thatthe add and subtract relays, AD and SB, have an operate time somewhat greater than twice the operate time of the register relays to thereby permit sufiicient time for operation of one or mor register relays before thesuccessive add or subtract relay. is operated. The circuit for holding relay R2 operated extends-from ground at IOI, operated key AI make contact I2! and through the lower winding ofrelay R2 to battery. An extension of this. circuit extends from. make contact I2I, contacts I33 and through the upper winding of relay RI to bat.- tery. Relay RI is a differential relay and, since both of its windings are energized in opposition the relay is operated to its released position and at back contacts I35 lights lamp LI. The opening of make contacts I35 removes the short-circuit from ground relay R4 with. the result that relay. R4 now energizes in series with the lower winding of relay R3 as follows: ground through upper winding of relay R4, contacts I14 and through the lower Winding of relay R3 to battery. At contacts I61 relay R4 prepares a circuit for maintaining itself operated and for releasing differential relay R3. Shortly after the release of relay RI and the operation of relay R4 the second add relay AD2 is operated from ground at contacts I02.

Relay AD2 at contacts I4I completes a circuit for holding relay R4 operated and for releasing relay R3 as follows: from ground back contacts I35, make contacts I4l, operated key A2, key S2, make contact I6I where the circuit divides one branch extending through the lower winding of relay R4 to maintain R4 operated and the other branch extending through I13 and upper winding of relay R3 to battery. Relay R3 releases and opens the short circuit around the upper winding of relay R6 with the result that relay R6 is now operated in series with the lower winding of relay R5 over contacts 204 and at back contacts I15 lights lamp L2. Relay AD2 also at contacts I42 completed the circuit for operating the third add relay AD3 but this relay did not fully operate until after the succeeding register relays had performed the above described operations.

Relay AD3 at make contacts I 8| completes a circuit for holding relay R6 operated andxfor releasing relay R5 asfollows: from ground-back contacts I15, make contacts I8I, operated key A3, contacts'IBI, operated key S3, make contacts 2I5 where the circuit divides, one-branch to the lower winding of relay R6 and the other branch extending through contacts 203 to the upper winding of relay R5 to battery. Relay R5 releases contacts 205 to-light lamp L3 and to-remove the short-circuit around the upper winding of relay R8 whereupon relay R8= operates in series with relay R1 as follows: ground upper winding of R8,- contacts 234 and lower winding of Rl to 11 battery. Relay AD3 also at contacts I82 completes the circuit for operating the fourth add relay AD4 which relay is not fully operated until after the above mentioned register relays have operated.

Relay AD4 closes its make contacts 2II without result at this time because the associated add key A4 is not operated and at 2I2 completes a circuit for operating the succeeding add relay ADS. In a similar manner successive AD relays ADB to ADIO, inclusive, are energized at this time without result. Each time relay ADIO operates it completes a circuit for the positive limit t'est relay PL at make contacts 4I2. At contacts 49I relay PL prepares a point in the circuit to determine if the positive limit has been reached, but the circuit to the positive limit relay PS is not completed until the positive limit number is reached or exceeded as will be more fully described hereinafter.

v Slow-to-release relay SL releases a predetermined time after its circuit is opened at contacts I04 and at contacts I I5 opens the locking circuit of ADI which restores. Relay ADI at contacts I08 and I09 opens the circuits to the registers TR and PR, at IEII opens the holding circuit through the lower winding of R2 to release R2, at I02 opens the circuit to AD2 to release AD2, at I03 opens a point in its own locking circuit and at contacts I04 reenergizes relay SL.

Relay AD2, upon restoring, at contacts I4! opens the holding circuit of relay R4 which releases and at I42 opens the circuit to AD3 which restores. Relay ADS at I8I opens the holding circuit of R6 which restores and at contacts I82 opens the circuit of relay AD4 which releases. Relays AD4, ADE, ADS, AD'I, AD8, ADS, ADIO and PL release in succession and in the order named without result at this time. In response to the first additive input relays RI, R3, R5 have been restored .while all other odd register relays are operated and relay R8 is the only even register relay which at this time is operated. The restoration of odd register relays RI, R3 and R5 have lighted lamps LI, L2 and L3 to indicate the registration of the binary number 111 (decimal digit 7).

In response to the next, or second, additive ground pulse received over additive lead A relay ADI is again operated and again locks at I03 over I I5. The PR and TR registers are again operated at contacts I09 and I08. At IIiI relay RI is again operated while at I02 the circuit is closed for relay AD2. Relay RI at make contacts I35 again completes the circuit to operate R3 and relay R3 at make contacts I15 again completes the circuit to operate R5. Relay R5 at make contacts 205 completes a circuit for holding the lower winding of relay R8 energized and completes a circuit through the upper winding of difierential register relay R'I over keys A4 and S4, make contact 245 and 233. Since the upper and lower windings of relay R1 are in opposition relay I releases and at make contacts 2355 removes the short-circuit from around the upper winding of relay RI I) to thereby permit relay RIO to energize its upper winding in series with the lower winding of relay R9. whereby relay RIO is energized while relay R9 is maintained operated. Shortly after the operation of those register relays the second add relay A132 is operated from contact I02 of ADI.

Relay AD2 at contacts I4I removes the short circuit from around the upper winding of relay R4 to thereby energize relay R4 in series with relayR3 and at contacts I42 completes thecircuit for relay ADS. Relay AD3 at contacts I8I removes the short circuit from around the upper the release of relay ADI the short circuit around.

the upper winding of relay R2 is removed with the result that relay R2 energizes in series with the lower winding of relay RI which is maintained operated. Relay AD2 releases when its circuit is .opened at contacts I02 by relay ADI and at back contacts I4I completes a circuit through the lower winding of relay R4 to maintain it operated and also completes a circuit by way of contact II3.through the upper winding of difierential register relay R3 to cause the release of relay R3. Relay R3 upon restoring, at back contacts I15, make contacts I8I, operated add key A3, back contacts ISI, operated key S3, make contact 2I5 and contacts 203 completes the circuit through the upper. winding.

of differential relay R5 to cause it to restore while relay R6 is held operated. The restoration of relay R5 at contacts 205 opens the holding circuit of relay R8 to cause relay R8 to restore. Relay AD3 releases shortly. after the operations of these last mentioned register relays when its circuit is opened at contacts I42 by the release of relay AD2. At contacts I8I relay AD3 opens the holding circuit of relay R6 which releases and at contacts I82 opens the circuit to add relay AD'4. Add relays AD4 to ADIO successively restore without efiect at this time. From the foregoing it will be seen that in response to the receipt of the second additive input odd register relays R3, R5, R! are in released position while all other odd register relays are energized with the result that lamps L4, L3, and L2 are lighted to indicate the binary number 1110, which is the equivalent of the decimal number 14. Thus two additive inputs have been added, or binary number 111 (decimal 7) plus binary number 111 (decimal 7) equals binary number 1110 (decimal 14). The even numbered register relays R2, R4 and RIO are the only even numbered register relays in operated position.

In response to the third additive ground pulse received over the additive lead A relay ADI is again operated and again locks over H5 and operates the associatedregisters PR and TR as well as completing a circuit for the second add relay AD2. At contacts IOI relay ADI completes a circuit for holding, relay R2 energized through its lower winding and also completes a circuit by way of contacts I33 through the upper winding of relay RI. Relay RI, being a differential relay, restores and at contacts I35 disconnects ground from the lower winding of relay R4 to cause relay R4 to restore. Shortly after the release of relay A4, relay AD2 is operated to cause the operation of relay R3 over the following circuit: from ground back contacts I35, make contacts I4I, operated key A2, key S2, back contacts I6I and through the lower winding of relay R3 to battery. Relay R3 operates its contacts I14 to short circuit the upper winding of relay R4 and at make contacts I15 completes a circuit for Slow-to- Operating relay R5- aslfollows :-;from: ground :make

contacts I15, back contacts I8l, operated key A3, back contacts i9l, operated. key S3, back contacts 2I5and through the lower winding ofrelay R5 to battery. 1 At. contactsi204 relay R5. shorts the upper winding of. relayRG and at contacts 205 completes a circuit for operating relay RI. from ground,.make contactss205, keys A4 and S4, back contacts 245 and through the lower windingof relay R1 to battery. Relay R1 at contactss234 shorts relay R8 and completes acircuit for holding relay Rlfl energized and for releasing relay R9as follows: from ground,.make contacts 235,

key A5, back. contacts 25I, operated key S5, make contacts 215 when'the circuit divides, one branch extending throughthe'lower winding of relay RI to hold this relay operated andztheother branch extending-by way of contacts:263. and the upper winding of relay R9to battery. Relay R9, being a differential relay, releases when both-its windings are energized in opposition... Relay R9 at contacts 265 removes the short circuit from around the upper winding of relay RI2 whereupon relay RI2 now energizes inseries with-the lower winding of relay RI I.

Relay AD3 operates a predetermined time after its circuit is closed by relay AD2 at contacts I42 and atcontacts IBI removes the short from around-the upper winding of'relay'R6 to-permit relay R6 to energize in series with. relay R5. .Re-" lays A134 to ADIIl operate in succession without result at this time because the associated add keys are not operated.

A predetermined" time after? theoperation. of relay ADI slow-to-release relaySL: releases and opens the locking. circuit of relay. ADI which thereupon restores. At contacts" I 0| relay ADI opensathe holding circuit of relay R2 which re-.

stores and atcontacts I02. opens the circuit of rela AD2 which restores. Relay AD2 at contacts M I opens the short circuit around the upper winding of relay-R4 to permit relay'R4 to operate in series-with the lower winding of relay R3. At contacts HIZ- relay AD2 opensthe circuit to:relay A133: which: restores. Relay AD3-at back con tacts I 8| closes a circuitv for holding relay R6 operated and:for releasingrelay- R5as follows: from make contacts I15, back contacts I8I, operated-key A3, back contacts I9I, operated key S3; make'contacts 2I5 where-the circuit divides one branchextendin g throughthe lower winding of. relay R6 to hold R6 operated and the other branch extending byway of'contacts 203 and the. upper winding ofrelay R5 to battery. Relay R5, being a differential relay releaseits operated contacts in responsetotheclosure of this circuit. At contacts235 relay R'I- removes the short circuit from. around the upper winding of relay- R8 whereupon relay -R8- energizes over its upper winding in series'with the lower winding. of relay RI. Relays ADA to- ADIO restore successively without result atthis time.

From the foregoing it will be seen that in re.- sponse to the receipt-of the third additive input the odd register relays RI, R5 and R9 are in released position while all-the other oddregister relays are energized with the results that lamps LI, L3, and'L5 are lighted to indicate the binary number 10101, which is: equivalent to.-the decimal number 21. Thus three additive inputs have-been added to register binary number-10101. The even-numbered register relays R4; R6, R8,- RIB and RI'Z- are the only evennumbered registerrelays in operated position.

:Each; register. unit; comprises zan Olddo register relay'and an even register unit, such as relays R3'iand R4. in the second register unit, and these relayscan be operated in three different manners from ground extending from contacts on the odd register relay of the preceding register unit, such as; ground at contacts I35 of register relay RI. One manner of operation results from a carryover operation when the preceding odd register relay (RI) changes its position. Another manner of operation; results from the operation of the associated addrelay AD2 in case the associated add key. A2 is operated, otherwise Without the operation of'the, associated add key the operation of the associated add relay is without effect. The third manner of operation results from the operation of the associated subtract relay SB2 in case the associated subtract key S2 is operated; or if the subtract key S2 is not operated then the operation or subtract relay SBZ is without effect. Only the first ten register units are provided with add and subtract keys (A and S) and -therefore when the add and subtract relays associated with these register units are operated, the associated register relays. are controlled by these add or subtract relays only in case the corresponding add or subtract key is operated. The remainder of the register relay units, comprising the eleventh to the nineteenth register units, are not provided with-any add or subtract keys but the subtract relays are connected in the circuit of each register unit so as to control the associated register relays for each operation of the-subtract relays.

With the above explanation in mind and since each register relay "unit is practically identical except for the abovenoted diiTerences it. isbelieved unnecessary tofully. explain the detail operations of. all the register relay units since their operations are similar. It is believed. sufficient if the detail circuit operations for one of the register relay units is .fully explained. As an example the second register. relay unit, comprising register relays R3 and R4, will be taken for this purpose. As previously described, all of the odd register relays have been operated in response to the operation and release of reset key RS and relay RSis energized through its lower winding from ground at contacts I35 from the preceding register relay RI. This circuit may be traced from ground make contacts I35, back contacts MI, operated key A2, key-S2, back contacts IBI and:- through the lower winding of relay R3-to battery. Relay R3 at contacts I 14 closes a short-circuit aroundth'e-upper winding of relay R'fiI- from ground at I35. Now in case ground extending from contacts I35 is disconnected from the lower winding of relay R3 and the upper winding of relay R4 relay R4 is energized in serieswith relay R3. This disconnection of grou-nd'can takeplacein a number of waysyfor example, the proceding register relay RI could be released to'efiect a'carryover operation or by the operation of the associated add relay AD2 operating contacts- MI, and incase the associated subtract key S-Zis operated by the operation of subtract: relaySBZ operating contacts I5I.

Theregisterrelays R3 and R4 are now in 0pera-ted position andwhen ground is connected to contact I51 by the operation of either the add or subtract relays or'by'the operation of the preceding registerrelay, relay R4 'is held-through its lower. windingwhile a circuit is completed. by way ofcontact's FIB-through-thev upperwinding of relay..R-3; Relay R3. being aidiflerential relay; releases .its..op.erated contacts .with-thezresult; that only relay R4 is held operated. Now when ground is removed from contacts IBI by the operation of either the add, subtract or preceding register relay, relay R4 releases its operated contacts.

Both relays R3 and R4 are now in deenergized position and, when contacts IBI are again grounded by the operation of either the add, subtract or preceding register relay, relay R3 is energized through its lower winding to again operate its contacts. The relays R3 and R4 have now gone through a complete cycle of operation and the operations from here on are the same as previously described. From the foregoing description it will be seen that the odd register relay R3 is restored for each odd ground pulse received and is operated for each even ground pulse it receives and that it lights lamp L2 in its restored position to indicate the binary numeral 1 for this particular digit order. All of the other register relay units operate in a similar manner and it is therefore believed unnecessary to describe the detail operations of all the register relay units.

POSITIVE LIMIT The additive inputs continue until the positive limit is reached or exceeded. Since the positive limit has been set at binary number (decimal 51,200) then the highest number that can be registered is 1100011111111110 (decimal 51,198) before the positive limit is reached. Assuming now that the binary number (51,198) has been registered on the register relay units by successive additive inputs. In this case the following odd register relays are in released positions: R3, R5, R1, R9, RI I, RI3, RI5, RI'I, RI9, R2l, R29 and R3I to light their associated lamps L2, L3, L4, L5, L6, L1, L8, L9, LIO, LII, LI5, and LI6 to register this binary number.

In response to the next additive input the binary number 111 (decimal '7) is added to the previously registered binary number (51,198) resulting in binary number (decimal 51,205) and the following odd register relays are in their released positions: RI, R5, R23, R29 and R3I. These released relays light their associated lamps LI, L3, LIZ, LI5 and LI6 to register binary number 1100100000000101 (decimal 51,205).

As previously described when the tenth add relay ADII] is operated positive test limit relay PL is operated from ground at make contacts 2 and when relay ADI!) releases a circuit is completed before the slow-to-release relay PL releases for positive limit relay PS as follows: ground at back contact 4 I2, contacts 49I, positive test control conductor PC (to Fig. 2), normally closed contacts 209 of key P3, back contacts I of released register relay R5, contacts 240 of key P4, make contacts 23I, contacts 210 of key P5, make contacts 28I, contacts 3II1 of key P6, make contacts 30!, contacts 340 of key P'I, make'contacts 33I, contacts 310 of key P8, make contacts 35I, contacts 4I0 of key P9, make contacts 40I, contacts 440 of key PIII, make contacts 43I, contacts 410 of key PII, make contacts 36I, closed contacts MS of PIZ, back contacts 425 of released register relay R23, contacts II! of key PI3, make 16' contacts 453, contacts 408 of key PI4, make contacts 483, closed contact 3I9 of operated key PI5, back contact 325 of released relay R29, closed contact 3I8 of operated key PIG, back contact 353 of released relay R3I, contacts 306 of key PII, make contact 383, make contact 225, contact 253 and through the upper winding of relay PS to battery. Relay PS operates over the above traced circuit. The reason relay PS did not op- 1 erate on the registration just before this last additive input T is because relay R23 was energized and therefore the circuit to relay PS was open at back contacts 425. Positive limit relay PS, upon operating, at contacts 283 completes I an obvious circuit for operating the positive limit register PLR to register the number of times that the positive limit has been reached. At contacts 284 relay PS completes a locking circuit for itself, at contacts 285 lights the positive limit lamp PSL, and at contacts 296 and 291 controls external circuits for controlling other positive limit signals or apparatus, if desired.

2 Since the positive limit has been reached, the operator may stop further inspection at any time by pulling the switch SW to thereby disconnect ground and battery from the relays and circuits to thereby release all operated relays and to extinguish all lamps. By the operation of lamp PSL the operator is advised that the batch under inspection is good.

It should be understood that during the above described inspection a bed sample may also be tested in which case a ground pulse is connected to the subtract input lead S instead of the additive input lead A.

SUBTRACTIVE INPUT It should be remembered that the subtract keys SI, S3, S5, S8, S8, S9 and SID have been operated and that the subtract relays are so wired as to add the binary number 1111111111110110101 (decimal number 524,213) to any previous registration to efiectively subtract the binary number 1001011 (decimal number '75) from such a total. However, it may so happen that no registrations, or a total of additive registrations less than the decimal number have been registered in the machine in which case the machine registers an ambiguous number easily noted by the excessive lighting of the register lamps. In order to describe this condition it will first be assumed that no registrations have taken place and that the switch SW and reset key RS have been operated as previously described to energize all of the odd register relays Rl to R31, inclusive, and relay R2.

When the subtractive input lead S is momentarily grounded relay SBI energizes and locks operated to contacts [I6 by way of contacts II3. At contacts I I8 relay SBI completes a circuit for operating the negative register NR to register each received subtractive input, at H! operates the total register TR, at contacts III completes a circuit for holding relay R2 and for releasing relay RI, at contacts II2 completes the circuit for operating the second subtract relay S32, and at II4 opens the circuit to the slow-to-release relay SL. The circuit for holding relay R2 operated and for releasing relay RI extends from ground at contacts I II, operated key SI, make contact I2I where the circuit divides one branch extending through the lower winding of relay R2 to battery and the other branch extending by way of I33 and the upper winding of relay RI to battery. Since both windings of relay RI are now energized'in opposition relay RI releases.

Relay RI atmake contacts I 35 removes-the short- R4 with the result that the upper winding of relay R4 is energized in series with the lower winding of relay- R3-over contacts I14 to causerelay R4 to operate and relay R3 to be held operated.

Shortly after relay R4 operates relay S32 is operated from contacts I12 and since the subtractkey S2 is not operated the operation of relay SE2 is without effect except for closing the circuit to the third subtract relay SE3.

The operation of relay SE3 at contacts I9I opens the short-circuit around the upper winding of relay R6 ,whereuponrelay R6 energizes in series with relay R5 over contacts 234 thereby operating relay R6 and maintaining relay R5 operated. -At contacts I92 relay SE3 closes the circuit to relay SE4 over an obvious circuit.

Relay SE4 operates andsince subtract key S4 is not operated no circuit changes-take place in the register relays. At contact 222 relay SBfl closes the circuit to relay S135.

Relay SE5, upon operating, at contacts 25I removes the short circuit to the upper winding of relay RIO which now energizes in series with the lower winding of relay R9 over contacts 264 to maintain R9 operated and'to operate relayRIfi. At contacts'252 relay SE5; closes the circuit to operate relay SB6.

-Relay SBIS in a manner similar to that described forthe other register relays, causesthe operation ofrelay-RIZ while relayRII is held operated in a local circuit includingthe upper winding of relay-RIZ and the lower winding of RI I when-the short-circuit of the upper winding of relay RII is removed at contacts 28I. At contacts 282 relay SBG closes the circuit to relay SB'I. Since the subtract key'SI is not operated the operation of relay SBI is withouteffect other than to closethe circuit tooperate relay SE8 at contacts 322.

Relay SE8 at contacts 35I causes the operation of relay RIfi and maintains relayRIB operated. At contacts 352 relay SE8 closes the circuit to operate SB9. Relay SBS at contacts 38! causes the operation of relay RI9 and mainta ins relay RI'I operated. .At contacts 332 relaySBB closes the circuit to operateSBIG. RelaySBII! at contactsAZI causes the operation of relay R20. andmaintains relay RI9 operated. At contacts 322 relay SBIEI operates relay SBII. Relay SB II at contacts. MI removes the short circuit from around the upper winding of relay R22 to thereby operate relay R2 2 from ground.

through the upper winding of relay R22, contacts 464, and through thelower winding of relay R2I to battery. Relay R22 is operated and relay R2In1aintained in this circuit. It should be noted that no subtract key is provided in this eleventh register rela unit and also that in the remainder relayunits twelve to nineteen, in

.clusive,.no subtract. keys are provided andas the twelfth to nineteenth subtract relays SB I2 to SB I9 are-sequentially operated, in a. manner obvious frornthe foregoing description, the corresponding .even numbered register relays are operated in their local circuits with their corresponding .odd -register relays. For example,

relay R23 is operated inseries with relay R23 for the twelfth register relay unit. Relays R23, R28, R39, R32, R33, R36 and R33 are operated and relays R23,.R2l, R2.9,.R3I, R33, R35 and R31 are-held operated by-thesequential operations of the subtract relays S1313 ,to,SB I9,,inclusive.

circuit from around the upper winding of relay When slow-to-release relay SL releases after its circuit is opened at contacts I It by relay SBI,

relaySL at contacts H6 opens the locking circuit of relay SB-I which restores. At contacts III relay SBIopens the holding circuit of relay R2 which releases. .At contacts .II2 relay SBI opens the circuit to relay SE2 which releases. The release ofrelay SE2 atthis time does not effect the second register relay unit but at contacts I 52.-relay SB2 opens the circuit to relay SE3. .At back contacts I9I relay SE3 completes .a circuit for releasing relay R5 and for holding relay R6 as follows: from ground at make. contacts I15, back contacts I8I, operated key A3,

back contacts I9I, operated key S3, make contacts 2I5 Where the circuitdivides one branch extending through the lower winding-of relay R6 to maintain this relay operated and the other branch extending over contacts 203 and through cuit to relaySB3 which restores. Relay S134 at contacts 222 .causes the release. of relay SE5.

Relay SE5, upon restoring, completes a circuit for holding relay RID operated and for releasing relay R9 asfollows: from ground, make contacts 235, key A5, back contacts 25I, operated key S5, make contacts 215 where the circuit divides one branch extending through the lower winding of relay RI I! to hold this relay and the over branch extending over contacts 263 and through the upper winding of difiertntial relay R9 to cause the release of R9. Relay R9 at-back contacts255 completes a circuit from this relay and the other branch extending over contacts 303 and upper winding of relay'RII to cause the release of relay RII. *Relay'RII at contacts 305 opens the short circuit around the upper winding of relayRI I to cause relay RM to operate inseries with relay RI3. At contacts 252 relaySB5 opens thecircuit to relay .5135 which releases after the preceding register relay operations.

At, contacts 28I relay SBE opens the holding circuit throughthelowerwinding of relay RIZ which restores and at contacts'282- relay SE6 opens the circuit to relay-SE1. At contacts 32I relay SB'I opensthe-holding circuit of relay RIG which restores and .at'322 opens the circuitto relay SBB.

Relay S138 at contacts 35! completes a circuit for holding relay RIB operated and for releasing relay'RI5 from make contacts At contacts 365 relay RI5 completes a circuit through make contacts 33! and operatedkeySI! for holding-RI8 .operatedand for releasing relay RI'I.

At contacts 495 relay-RI! completes a circuit through make contacts MI and operated key S I 0 forholding relay R29 operated and for releasing relay RI9. At contacts 435 relay RI9 completes a circuit throughmake contacts MI for holding relay RZZoperatedandfor releasing relayRZI. Ina manner similar to that just described the succeeding odd register relays of the remaining register relay units are released in succession by the release of the preceding odd register relays and v the. associatedv evennumbered register relays in the remaining units are held in operated position. Therefore, relays R23, R25, R21, R29, R31,

R33, R35 and R31 are restored while relays R24,

7 R25, R28, R38, R32, R34, R36 and R38 are held opens the holding circuit of relay RI8 and at contacts 382 opens the circuit to rela SBI I] which restores. The subtract relays SBII) to SBI9 restore in succession and each subtract relay opens the holding circuit to the associated even num bered register relay to cause these even numbered. register relays to restore in succession. Relays R29, R22, R24, R26, R28, R30, R32, R34, R36 and R38 are therefore restored.

From the foregoing it will be seen that in response to the receipt of one subtractive input overthe S lead the'odd register relays RI, R5, R9, RI I, RI5, RI'I, RI9, RZI, R23, R25, R21, R29, R3I, R33, R35 and R31 are in their released position to light their associated lamps. The number registered on the register relay units is the binary number 1111111111110110101 which is decimal number 524,213. Since only 17 lamps are provided, one for each of the first seventeen register relay units, then lamps LI, L3, L5, L6, L8, L9, LI II to LI I, inclusive, are therefore illuminated to display the ambiguous binary number (decimal number 130,997). Since this binary number is considerably larger than the set negative limit, the operator is aware of this fact by the excessive lighting of the display lamps. In addition the negative limit chain circuit through the negative limit keys N is open at several points and. therefore no circuit is completed to the negative limit relay NS at this time so that the operator does not receive an indication that the negative limit has been reached.

In case a second subtractive input is received the register relays and the subtract relays operate in a manner obvious from the foregoing description to again add the binary number Sum total 11111111111101101010 (1, 048, 426) In the above sum total the following odd register relays R3, R1, RI I, RI 3, RI? to R3? inclusive are in released position to light lamps L2,

L4, L5, L1, L9 to LI'I, inclusive.

Additional subtractive inputs cause the operation of the register relays in a similar manner until the negative limit has been reached or exceeded.

In order to further describe the operations of the register relay units after a number of additive inputs has been received and then the first subtractive input is received, it will now be assumed that eleven additive inputs havebeen reg istered on the register units after which asubtractive input is received. In this case the eleven additive. inputs equal '17 (or 11x7) or binary number 1001101 and therefore theodd register relays RI, R5, R1, and RES are in released position to light lamps LI, L3, L3 and L1 to display an indication that the binary number 1001101 is registered in the register relay units. In addition 20. the following even numbered register relays are operated R4, R6, RI I] and RI4.

It will now be assumed that a subtractive input is received to cause the sequential operation and release of the SE subtract relays. One cycle of operation of the subtract relays as previously described adds the binary number (524,213) to the registered binary number 1001101 (7 7) as follows:

l00l10l=registered number (77) 1lll1llll11lOll0l0l=add (524,213) subtract number (75) 0000000000000000010= (decimal number 2) The following is a detail circuit description of the .above noted subtraction effectively accomplished by adding a large number. When relay SBI operates in response to the receipt of the subtractive input pulse over lead S it completes a circuit at III for operating relay RI through its lower winding. At contacts I relay RI completes a circuit for holding relay R4 and for releasing relay R3 which restores and opens the holding circuit to relay R6 which likewise restores.

Relay SBI at contacts II2 closes thecircuit to SE2 which operates and closes the circuit to relay SE3 at I52. Relay SE3 at I9I completes a circuit for operating relay R5 through'its lower winding. At 295 relay R5 completes a circuit for operating relay RI. At 235 relay R'I completes a circuit for holding relay RI 0 and for releasing relay R9. Re-

lay R9 at 265 removes the short circuit from relay RI 2 which now energizes in series with relay RI I.

. At I92 relay'SB3 closes the circuit to relay SE4 which operates and in turn completes the circuit to relay SE5 at 222. At 25I relay SE5 opens the holding circuit of relay RI 0 which restores-and at relay RII opens the holding circuit of relay- RI4 which restores. At 282 relay SE6 closes the circuit to relay SBI- which operates and closes the circuit to relay SE8 at 322.

. Relay SE8,.upon operating, at 35I completes a circuit for holding relay RIG and for releasing relay RI5. At 365relay RI5 removes the short circuit from relay RI8 to permit relay RI8 to operate in series with relay RI I which is held op erated. At 352 relay SE8 closes the circuit to relay SE9 which operates.

Relay SE9 at 38I completes a circuit for holding relay RI 8 operated andv for releasing relay RI I by connecting ground to the lower winding of relay RI8 and by connecting ground through 403 and the upper winding of relay RI 1. The upper I and lower windings of relay RI'I are differential 445 and the upper winding of relay RI9. .Difi'erential relay RI9 releases due to its two windings being energized in opposition. At 435 relay RI9 removes the short circuit fromrelay R22 to permit relay R22 to operate in series with relay R2I which is maintained operated. At 422 relay SBI 9 closes the circuit to operate relay SBI I.

, lay R2I while relay R22 is held and the operation -;a similar manner the odd register relays R25; R21, R29, R3 I, R33, "R35 and R31 are released: and

' mined time after its circuit is opened at II 4 by the operation of relay SBI and relay SL at IIB short circuit from around the upper winding'of relay-RZ whereuponrelayRZ operatesina local relay RE which now operates in a local circuit with relay. R5 .whichis .held operated. -At I92 restores.

. makecontact :235,-key A5, back contacts25l; op-

ground from relay Rl2which restores. At 252 relay-SE opens the circuit to relaysBfiwhich restores.

At 305 relay RI I completes .a circuit throughthe lower winding of relay Rl3 which operates. 335 relay RI3 opens the holding circuit of relay, RIE which restores.

. the lower winding of; relay R I 5 .which operates. ...At 365 relay RI.5; opens thei-holdingv circuit of. relay cession. andcause: the operationof the successive "odd register relays and'the release ofvthe successive even register relays. in thesame .manner"-as tdescribedfor the release; of relay. S138. That-is, .odd register. relays RI'I to R31, inclusive,- are-suci cessively operated and i the even register: relays ..R2'0 to "R38, inclusive, are successively released.

atractive-linput,-relay;R3 .is the onlyodd register relay whichLis .1 in released. position-while 1 only relay .which. isreleased, then the registerrelay units have-been operated toregister-thebinary number 110 (:decima1r2). decimal. number '77 registered in1the:.reg-ister in" the binary form, and with: the addition of the ibinaryr'number equivalent to decimal: number 524,213. (whichaeffectivelysubtracts'tdecimal numivber 7.75 from the previous registration) lithe; re-

sult is ai. binary. number equivalent to stdeci-mal: 2

; same manner as described for relays-S139 and SBIIJ and also control their associated-register stores.

22 .as illustrated previously nearwthe .:;beginning of this explanation. From {the foregoing it .1 {can therefore be seen that the addition of a subtracrelay units in a imilar-manner. That s, the ;.tive:input efiectively;subtractsiazpredetermined operation of relay. SBI I causes the release of re- "5 amounti'froma previousregistration.

'NEG'ATIVE'VVLIMIT Relays SB I I to SE I 9, inclusive, operate-.:in=-t-h e of relay "R24 while ,relay R23'is held operated. The operation of relay. SBI2 causes the releaseof :Additive and su-btractive D continue .unrelay R23 while R24 is held operated and the optil sa positive limit is;reached-- as :previously;de eration-of relay R26while relay RZ5'1S1h81d. In .scribed or untila negati-velimit is reached or exceeded, it being understood that successive inputs -may be. either additive or subtractive. the even register relays R26; R28, R30; R132,"R34, As previously described, the negative limitas R36 and R38 are held operated. .set-,by the-operatednegative-limit keys NI-2, NI3, Slow-to-release relay SL- releases a predeter- N14 andtNI'I corresponds tothe binary number 1'0011-100000000000 (decimal number 79 ,872); and when thisnumber -isreached or exceeded a -circuit is completed to operate the negative iimit relay NS which operatesa signaLand the mega- RelaysBI, upon releasing, at I-I-I-removesthe .tive limit register.

In order to describe the resultsofreachin' :01 exceeding-anegative-limit, it willbe assumed that circuit in series with the lower winding-of-relay vsufficientsubtractive inputs have been -reeeived RI to maintain RI operated. At IIZ relay SBI rto-registeria very-large ambiguous number. For opensithe circuit to relay SBiZ. .Relay SBZ-at I52 325 example -'.it will the assumed that.-the- -last ,-nineopens the circuit towrelay $33 which restores. .teen digit orders in-the binaryform registered for Relay SB3 at I9I removes the short circuit from .this number is 1110011100000100010 and therefore the odd register relays "R31, R35, R33, R2], R2 5, "R2 3 R II and-R3 are in :their released .--posilay SB3zopens"t-hecircuit: to relay. BB4 which re- 5730 tionsto'registerthis corresponding-number. .;-,'1 he Ati- 2-22: relaysSBlI opensthecircuit to renext subtractive input to'beaddedrto this number lay $135 which restores. -willcause the registration .to reachythe negative Relay S135, atclcompletes a circuit from ;limi t but-;atthisparticulardnstant the negative 1 limit circuit- .to;-relay -INS; is-nowQPemat make conerated key S5, back-contacts 215, and through .35 tacts 302 of;r ele ased -re1ay; RI,I zand is-also open the lower winding of relay R9 to battery. Relay gatmakecontacts I12 -of; released-;relay;-R3. R9 operates and at 265 removes the "holding .In response to the next subtractive input:the

:subtract relays-rare operated'and, releasedes previously described to add the binary snumber e40,-111-111111l11;0 110101 (524,213) .to the ;previous registration as :follows.

opens the locking circuit to relay SBI which re- .Relay $36 at 28I completes the circuit'through thelower winding of relay RI I whichoperates. 1110011100000100010 (registered number) 111111r111110110101 (add 524',2l3)

' inioonbi un oidni total The description of the above noted addition in aresponse' to the next subtractive input will; now

be" described in. detailas follows: 1 Odd registerrelaysR3.'I,,-R35,'-R33, R21, R25, 'R23, -RI Irand-R3 are in released position and even numbered relays R34, R30, R24,-RI.4,-.RI2, -R6,-=R4=and- .R2--are in operated. position when 7 binary number 1 110011 100000100010 is'registered inthe register relay units.

'Relay SBI operates :and locks in; responseto the receipt ;of the incoming. subtract input: pulse .overylead-S. The subtract-.relays SBI to SBIS, rinclusive operate sequentially .tocontrol the register relays and thereafter release sequentially to further :control the register relays in a' manner r, obvious :from the foregoing descriptions with the result that afterthe release of -,.the last subtract -relay "SBI9 the following binary number 1110011011111'010111 is reg-istered bylthe'odd rezlays R3'I..R35, R33, R2.'I,=R25,;R2 |,R19','RH, RI5, 3 RI 3 ,1 R9, R5, R3 and-RI :intheir. released: positions xwhileithe evenrelays R345R30, R26, iR2"4, RI.4, -RI.2,'.RI0z-and. 'RB being in their operated-positions. "zwith the :last'i-mentioned .odd relays in At:..282 relay SB6 opens-the circuit-of relay SB! which restores. At 322.relay SBI: opens the. circuit of relay S138 which restores. Relay SBB .at35lcompletes a circuit through RI 3 whichrestores. M1352 relay: S138 .=opens:.the circuit of relay SB9 which restores.

iRelays .1SB9 to tSBI 9, .inclusive, i restore in suc- In response-to the receipt of .th'isl:-last-subthe even register *relays'RZ, R4 and R6 are operated. tSincerela y. R3 istheionlyoddregister Therefore, with lithe -LI4,tLI'3,-'LI I,1LI-0,"B9, L8,'LI,.I;5,':I 23,:L2;LI are illuminated :to indicate '1 the binary number 91001101111101-0111.

.ESince only. the negativelimitzkeys:NII, N I4 ;"N I3 75 .;and-N I 2-..are operated the circuit fonoperati-ngithe their released positions the following lampsfLI'i negative limit relay NS will be closed for the first time in response to the last mentioned registration.

When the last subtract relay SBl9 is operated said relay at make contacts 238 completes a cir cuit for operating slow-to-release relay NL which at contacts 398 prepares a circuit for grounding the negative limit control conductor NC. When relay SE19 releases said relay at back contacts 238 momentarily connects ground through contacts 398 to conductor NC. A circuit may now be traced for operating the negative limit relay NS as follows: from grounded conductor NC, closed contacts 492 of operated key Nl2, make contacts' 426 of operated odd relay R23, closed contacts 495 of operated key NI3, back contacts 454 of released relay R25, closed contacts M3 of operated key NM, back contacts 484 of relay R21,

normally closed contacts 324 of key N15, make contacts 326 of relay R29, normally closed contacts 323 of key Nlfi, make contacts 354 of relay R31, closed contacts 3| 3 of operated key NIT,

back contacts 384 of relay R33, back contacts 226 of relay R35, contacts 254 of relay R31, and

' through the upper winding of relay NS to battery.

Relay NS at contacts 291, completes a locking circuit for its lower winding controlled by the battery and ground connections supplied from Fig.

1A as previously described. Shortly after the release of relay SBI9 relay NL releases to remove ground from conductor NC.

Negative limit relay NS at contacts 292 completes a circuit to the negative limit lamp NSL to light said lamp and indicate to the operator that the negative limit has been reached. At 293 relay NS completes the circuit for operating the negative limit register NLR and operates contacts 294 and 295 to control other, 'or remote, negative limit signals, if desired. I

When the operator observes that the negative limit has been reached, further inspection of the parts will stop and the lot under test will be rejected as bad. The operator then operates the switch SW in Fig. 1A to disconnect battery and ground conections to release the apparatus to normal.

It should be noted that each of the limit keys are provided with a plurality of contacts so that the limit circuits can be closed at several points even though the limit may be exceeded by a fairly large number.

In order to assist in further understanding the circuit operations without describing the detail r from the additive total of these binary numbers the operated or released conditions of the various register relays may be determined. The binary digit 1, for any digit order, indicates that that odd register relay is in released position.

At the end of any input (additive or subtractive) and after either the adding relays AD or the subtracting relays SB have completed their cycle of operation and release, the following basis may be followed to determine the operated or released condition of the even numbered register relays directly from the instant registered number.

1. If an odd register relay is energized to regis ter a zero, the corresponding even register relay is in released position in case the. preceding odd register relay is in operated position als registering a zero. That is, two adjacent binary 24' numbers 0 and "0, where the second 0 is the preceding registration, then in this case the even numbered register relay associated with the first 0 is in released position.

No. 1 example R5 (operated), R6 (released), R3 (the operated preceding registe I ay 0 0 (registered binary number) 2. If an odd register relay is energized to register 0, the correspondingeven register relay is in operated position in case the preceding odd register relay is in released position to register 1.

No. 2 example R5 (operated), R6 (operated), R3 (the1 released preceding registe r ay 0 1 (registered binary number) 3. If an odd register relay is in released position to register 1, the corresponding even register relay is in operated position in case the preceding odd register relay is. in operated position to register 0.

No. 3 example R5 (released), R6 (operated), R3 (the]' operated preceding registe 7 re a, 1 0 (registered binary number) 7 4. If an odd register relay is in released position to register 1, the corresponding even register relay is in released position in case the preceding odd register relay is in released position to register 1.

No. 4 example R5 (released), R6 (released), R3 (the1 released preceding register re ay 1 ent binary digit order in a binary number, means for electrically transmitting additive inputs and subtractive inputs to said device, means responsive to the receipt of each additive input for operating certain of said register relays to add the binary number corresponding to the manually operated ones of said keys in said first set to a previously registered binary number, and means responsive to the receipt of each subtractive input for operating certain of said register relays to add a predetermined binary number and the binary number corresponding to the manually operated ones of said keys in said second set to a previously registered binary number to thereby effectively subtract a given number from said previously registered binary number.

2. In a binary calculating device, a set of keys, each key corresponding to a different binary digit order in a binary number, each key having a normal position corresponding to zero in its corresponding binary digit order and each key having an operated position corresponding to the binary numeral one in its corresponding binary digit order, register relays for registering binary numbers, each register relay corresponding to a different binary digit order and being individual to a corresponding one of said keys, pulsing contacts individual to each register relay, means for 2i contacts, means responsiveto L the'- operation of said individual pulsing contacts for operating only-those register relays having/ their individual' keysinoperated position to-add the-binary nu-- meral one to the binary digitordercorrespondingthereto, and means for-operating-a higherbinarydigitorder register relay inresponse --toa' carry-- over operation from the next lower binary digit order register relay between successive closures of saidpulsing contacts;

3; Ina binary calculating'device, a set of man-- ually operable keys, each key corresponding to-a difierentbinary digit order in a binary'number, register relays for registering binary-numbers,-

each'register relay correspondingto-a different. binary digit order in a binary number; a series:

circuit for each binary digitorder of anultimate binary'number comprising contacts on' a lower binary digit order register relay, the key.--crre-- spending to the instantbinarydigit order, and

windings on'the instant'binarydigit'order register relay for controlling carryovers from a: lower order seriescircuit to' the instant order series: circuit; pulsing contacts conneeted to=eachsaid series circuit, means for operating said pulsing contacts, and circuit means responsive to the series circuit for each binary digit ord'erof an ultimate binary number, each; seriescircuit in,- cluding a corresponding register relayand a corresponding key, a chain circuit includingsuce cessive ones of said'series' circuitsconnectedin' the order corresponding to their binary digit order for controlling-carryover operationsof saidregister relays from a lowerorder series-circuit;

to the next highest order seriescircuit, and puls-- ing means individual to each seriescircuit effec-:

tive to operate the corresponding register relay only in case the-corresponding key at such series 1 circuit has been manually operated.

5. In a binary calculating device comprising a series of registering unitseach corresponding to a difierent binary digit order in a binary number, each registering unit including register relays, a key, pulsing contacts andrelay contacts of: thexnext. lower order register unitt-means for operating said pulsing contacts in eachregister unit, a circuit in each: register, unit responsive to the operation of its corresponding pulsing contacts for controlling the operation of the register relays in such unit to add the binary numeral one thereto only in case the associated key in such unit is operated, and a circuitin each register unit controlled by said relay contacts in response to theoperation ofoneiof' said register relaysv in a lower order register unit for controlling the operation of said register relaysini the next higher order register unit to effect a carryover from said lower order to said next higher order register unit.

6. In a binary calculating device comprising a series of registering units each corresponding to a difierent binary digit order in a binary number, each registering unit including register relays, a key, pulsing contacts and relay contacts of the next lower order register unit; means for operorder register unit to effect a carryover from said lower order to said next higher order register unit, and indicating-means individual to each registering unit controlled by the operated conditionof '7. Inabinary calculating device, a pair of register relays for each binary digit-'order'in a binary number, a chain circuit interconnecting each pair of register relays with the next lower binary digit order register relays, circuit means including each chain circuit for operating the first register relay of each pair in response to alternate operations of the first register relay in the next lower binary digit order register relays and for releasing saidfirst register relay in response to the intervening operations of said next lower binary digit order first register relay, circuit -means-for operating the second register relay of eachpair in series with its associated first registerrelay in response to alternate release-operations of the firstregister relay in the nex-t lower binary dig-it order and for releasing said second register relay in response to-theintervening release-operationsof said next lower binary order first register relay, and meansconnected to each chain circuit foroperating any predetermined ones ofsaidfirst register relays,

8; In abinary calculating device as-claimed in claim '7 including-indicating means individual-to each said first register-relay for indicating the binary numeral registered therein dependent upon the operated or released condition of" the corresponding'first registerrelay;

9. In a calculator comprisinga series of register relay units, a series" circuit for interconnecting each adjacent relay unit, each register relay unit including an odd register relay and an even" register relay, means for'operating a succeeding oddregister relay overthe said series circuit interconnecting: a succeeding relay unit with a preceding relay unit in response to the-operationof the preceding odd register relay, means for operating the succeeding even registerrelayassociatedwithsaid operatedsucceeding odd register relay over a circuit local to the corresponding register relay unit in response to the release-of said preceding odd register relay, means for releasing said operated succeeding oddregisterrelay and for maintaining said operated succeeding even register relay operated in-response to areoperationof said preceding oddregister-relay, said operated succeeding even register-relay released in responseto therelease of-said reoperated preceding'od'd' register relay, and" register indi-,

series circuit between adjacent relay units, means for operating the even'register relay associated with said operated odd register relay over a circuit local to the relay unit containing said operated odd relay in response to the disconnection of said potential from said series circuit, means for releasing said operated odd register relay and for maintaining operated said operated even register relay in response to a reconnection of said potential to said series circuit, said operated even register relay released in response to the subsequent disconnection of said potential from said series circuit, and means for controlling the connection and disconnection of said potential to said series circuit.

' 11. In a binary calculating device, a set of manually operable keys, each having a normal and an voperated position, each key being individual to a different binary digit order in a binary number, register relays for registering binary numbers, each register relay being individual to a difierent binary digit order and being individual to one of said keys, a series chain circuit including interconnections between said register relays and said keys arranged in a predetermined order corresponding to the binary digit order of said register relays and said keys, a chain of relays, each relay of said chain being individual to a corresponding register relay, means for sequentially operating said chain relays in a predetermined order corresponding to the binary digit order of said register relays and said keys, and circuit means connected to said series chain circuit controlled by said sequentially operated chain relays for operating certain of said register relays dependent upon the keys which have been manuall set in their operated positions to register a binary number corresponding to said manually operated keys set in their operated positions.

12. In a binary calculating device, a set of keys each having a normal and an operated position,

each key being individual to a different binary digit order in a binary number, register relays for registering binary numbers, each register relay being individual to a difierent one of said keys and to the corresponding binary digit order a series chain circuit including said keys interconnecting said register relays in a predetermined order corresponding to said binary digit order, certain of said keys being manually set in their operated positions in accordance with an additive binary number, means for electrically transmitting additive inputs to said device, and circuit means connected to said series chain circuit operative in response to each additive input received for operating said register relays in accordance with said operated keys to cumulatively add said additive binary number to a previous registered binary number.

13. In a binary calculating device, a first set of manually operable keys set by an operator to register a predetermined positive binary number, a second set of manually operable keys set by an operator to register a predetermined negative binary number, a third set of manually operable keys set by an operator to register a predetermined additive binary number, a fourth set of manually operable -keys set by an operator'to--- register a predetermined subtractive binary numberyregister relays for registering binary num- 1 bers, each register relay being individual to a difierent binary 'digitj order in binary' numbers,

means for electrically transmitting additive, and

negative inputs to said device, means operativeresponsive to each "additive input received for operating said register relays to cumulatively add said predetermined additive'binary number to a previously registered binary number, means operative to each negative 'input received for operating said register relays to subtract said prede termined subtractivebinary number "from the previously registered binary number, 7 positivelimit indicating means controlled by said first set of keys operative in'response to said register relays registering a resultant amount -corresponding to said predetermined positive binary number, and negative limit indicating means controlled by saidsecond set of keys operative in response to said registerrelays registering a resultant amount corresponding to said predea different binary digit order in a binary number,

means, for electricallytransmitting additive inputsv to said device, means operative responsive to the receipt of each saidinput for operating certain of said register'relays to add the binary number corresponding to said manually operated keys to a previously registered binary number, a

second; set of keys, each key of. said second set corresponding to a different binary digit order in a: binary number upto a predetermined binary number, said second set keys operable manually byan operator in difierent combinations to designateidiiierent binary numbers, a chain circuit completed through the operated ones of said sec- REFERENCES; orrnn The following references are of record in the file of this patent: 7 I V UNITED STATES PATENTS Number 7 Name I Date 2,318,591 Coufilg'nal May 11, 1943 2,364,540 Luhn Dec. 5, 1944 2,394,924 Luhn r -7 Feb. 12, 1946 2,394,925 Luhn' Feb. 12, 1946 FOREIGN PATENTS Number Country Date Great. Britain May, 9, 1934 

